Across
- 4. danger, risk (syn)
- 5. natural home of an organism
- 7. not existent anymore
- 10. coal, oil, wood ...
- 11. a class of individuals having common attributes
- 13. not suited for living in
- 15. toxic (syn)
- 16. damaging (syn)
- 17. (to) throw or give sth out, e.g. light, heat, gas...
Down
- 1. long form of CO2
- 2. (to) pollute
- 3. the escape of used gas from an engine
- 6. the act or instance of burning
- 8. (to) rebuild, reconstruct (syn)
- 9. (to) clean (syn)
- 12. stock (syn)
- 14. when you prevent sth from being destroyed